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Some individuals experience stinging, pain, or tingling instead of itching. Other symptoms of vitamin B12 deficiency Other symptoms of the condition are listed by Bupa as: Feeling very tired Breathlessness even after a little exercise Heart palpitations Headaches A reduced appetite A sore mouth The health organisation adds: If you have vitamin B12-deficiency anaemia, you may also look pale or jaundiced (have a yellowy tinge to your skin and the whites of your eyes)

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Retrieved from WHO

Its narrow, fragment-specific mechanism makes it a frequent comparison point in studies exploring how isolated peptide regions behave differently from their parent hormone a topic covered in more depth in our roundup of best peptides for fat loss research

Though not yet proven, limited evidence suggests an increased cancer risk in those with higher-than-normal B12 levels

Vitamin B12 can be found in dairy products like milk and cheese and foods like eggs, red meat, and fish